Fort Worth weekly gazette. [volume] (Fort Worth, Tex.) 1882-1891, 1887-02-25
POPULAR SCIENCE.

new lncandescent lamp manufactured
in Austria is remarkable for the form and
material of it's thread and the method of
carbonizing it. II is of clover-lesf shape,
is made Of manila hemp, and is car
bombed by bath Of mineral oil. The
ends of the thread are afterwards gal
vsniZed and soldered 10 platinum wires
which pass through the bulb; the ends
of these platinum wires are previously
turned spiral-like by means Of very
simple machine: the eleCtrOlytiC deposit
is copper deposit and the soldering is
made with silver. For obtaining
vaCum they resort to Geisler mercury
pump. The vacuum is made in several
lamps at the same time Generally seven,
and they take care 70 render the threads
incandescent, as usual, during the last
part of this operation. TEeir duration is
estimated at 1000 hours.
Experienced wood workers have always
contended that glue Joint, properly done,
is stronger than the wood itself. And
get joints often give way at the surface
where the glue is used, which is &C
counted for by bad material. A similar
ressOn is frequently the true cause, which
few artisans wish to ackno Wledge. II is
merely that skill is lacking. In gluing
wood, it IS asserted by competent author
ity, bsd work is produced by applying
glue to both surfaces. A good Job is Sc
cured by applying the glue hot, bat not
extremely SO, to one surface, which
should be cold, while the other surface
should be heated at the stove, but should
have no glue upon it. BY this method the
glue Will permeate the wood and bind the
surface together more firmly than nature
binds the tibres.
Careful experiments on the serse of
smell in dogs have been made by George
J. Romans, who has communicated the
results to the Linnean Society of London.
He finds that rot only the feet but the
whole body of man exhales a peculiar
or individual odor which dog can recog-
nize as that of his master amidst crowd
of other persons; that the individual
quality of this odor can be recognized at
great distances to windward, or in calm
weather at great distance in any dlrec-
ton; and that even powerful perfumes
may not overcome this odor. Yet sin
gle sheet of brown paper, when stepped
upon instead of the ground and afterward
removed, was sufficient to prevent Mr..
Romans dog from following his trail.
it is now fairly established that the
common Wart, which is SO unSightlv and
often prollferous on the hands and face,
can be easily removed by small doses of
sulphate magnesia taken internally. NJ.
Colrat OF Lyons, has drawn attention to
this extraordinary fact. Several children
treated with three grain doses of EPSON
salts, morning and evening, were prompt
ly cured. NJ. AubeTs cites the case of
woman whose face was dishgured by
these eXcreScenCes, and who was cured
in month by dram and a half OF mag
nesis taken daily. Another medical man
reports case of very large warts which
disappeared in fortnight from the daily
administration Of ten grains OF :he salts.
Il The Medical Press.
Manufacturers of kerosene oil say that
all lamps are safe with good oil, and that
the quality of oil can be ascertained by
the following test: Take a pint lineup,
fill it nearly full of water warmed so that
an ordinary thermometer immersed in 1t
will show 100, pour II small qusntity of
oil on the wster, stir it little, then pass
lighted match quickly but closely over
the surface Of the oil once; if it ignites
the oil is unsafe. If purchases be made
of from three to five gallons at time and
this test be made people can protect them
selves.
boiler furnace in combination with
grste, bridgewall and smoke chamber is
newly patented invention. There is
piyotsliy suspended rear-plate, providing
the only communication to the smoke
chamber from under the plate, which
latter is provided with 4 rod for swinging
it rearWard An cir channel through
the base of the furnace communicates
with the gasduct through ali opening di-
rectly below and opposite to the depend
ent plate, which channel is furnished
with valve to regulate the admission
of air.
Fer some time pas, says Industry, gas
water has been spilled directly to agri-
cultural land as fertiliz r, with satisiac
tory results. An average strength of
shout s. Tw, Is employed, aid ~ this
Strength gallon CT the water is equal
to about one pound OF sulphate of anu
monia. The former will cosG about IS.
per thiIty-tve gallons. 1t is applGd to
the land from barrel by means of pipe !
drilled with holes, just in the same way !
es The streets of large towns are wstered. I
The quantity used is about 100 gallons |
per acre.
In the extensive oyster culture expert
ments of the United States government
particular attention is being given to
methods for preserving the young. Wire
baskets three feet square and six inches
deep are used for collecting the spat,
which adhere closely TO the sides and
bottom, this device enabling the operators
to prevent the accumulation of mud, the
great foe of the oyster industry, by fire.
queat shGkings of the baskets. An aver
age oyster is expected TO yield l0,000,00
young.
A new method of securing veneer to Its
base consists IN spreading glue or other
adhesive matter between the veneer and
the base, passing the two secured parts
under heated roller to melt the glde
and cause it to enter the pores to the
wood, then finally passing the connected
base and the veneer under chilled rollers
to harden and set the glue, aud prevent
the waTping or shrinking of the veneer
upon the gradual cooling or
drying of the glue.
10 make good, cheap vsrnish: Borax,
10 parts; powdered white shellac, 30
parts; water, 200 parts. Dissolve on the
water bath, which will take severed
hours; when cold filter. The addition of
. few drops of glycerine will make the
7arnish much more flexible. For black d,
ldd nigrosiu, soluble in water; for blue, !
nethyl blue, alkali blue or marine blue;
or green, use malachite green or brilliant {
green, and for violet use methyl violet.
All these are coal-tar colors.